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diff --git a/docs/drools/feature_testtransaction.rst b/docs/drools/feature_testtransaction.rst new file mode 100644 index 00000000..488ee1a5 --- /dev/null +++ b/docs/drools/feature_testtransaction.rst @@ -0,0 +1,106 @@ + +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 + +************************* +Feature: Test Transaction +************************* + +.. contents:: + :depth: 3 + +Summary +^^^^^^^ + +The Test Transaction feature provides a mechanism by which the health of drools policy controllers can be tested. + +When enabled, the feature functions by injecting an event object (identified by a UUID) into the drools session of each policy controller that is active in the system. Only an object with this UUID can trigger the Test Transaction-specific drools logic to execute. + +The injection of the event triggers the "TT" rule (see *TestTransactionTemplate.drl* below) to fire. The "TT" rule simply increments a ForwardProgress counter object, thereby confirming that the drools session for this particular controller is active and firing its rules accordingly. This cycle repeats at 20 second intervals. + +If it is ever the case that a drools controller does not have the "TT" rule present in its *.drl*, or that the forward progress counter is not incremented, the Test Transaction thread for that particular drools session (i.e. controller) is terminated and a message is logged to *error.log*. + +Usage +^^^^^ + +Prior to being enabled, the following drools rules need to be appended to the rules templates of any use-case that is to be monitored by the feature. + + .. code-block:: java + :caption: TestTransactionTemplate.drl + :linenos: + + /* + * ============LICENSE_START======================================================= + * feature-test-transaction + * ================================================================================ + * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved. + * ================================================================================ + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * ============LICENSE_END========================================================= + */ + + package org.onap.policy.drools.rules; + + import java.util.EventObject; + + declare ForwardProgress + counter : Long + end + + rule "TT.SETUP" + when + then + ForwardProgress fp = new ForwardProgress(); + fp.setCounter(0L); + insert(fp); + end + + rule "TT" + when + $fp : ForwardProgress() + $tt : EventObject(source == "43868e59-d1f3-43c2-bd6f-86f89a61eea5") + then + $fp.setCounter($fp.getCounter() + 1); + retract($tt); + end + query "TT.FPC" + ForwardProgress(counter >= 0, $ttc : counter) + end + +Once the proper artifacts are built and deployed with the addition of the TestTransactionTemplate rules, the feature can then be enabled by entering the following commands: + + .. code-block:: bash + :caption: PDPD Features Command + + policy@hyperion-4:/opt/app/policy$ policy stop + [drools-pdp-controllers] + L []: Stopping Policy Management... Policy Management (pid=354) is stopping... Policy Management has stopped. + policy@hyperion-4:/opt/app/policy$ features enable test-transaction + name version status + ---- ------- ------ + controlloop-utils 1.1.0-SNAPSHOT disabled + healthcheck 1.1.0-SNAPSHOT disabled + test-transaction 1.1.0-SNAPSHOT enabled + eelf 1.1.0-SNAPSHOT disabled + state-management 1.1.0-SNAPSHOT disabled + active-standby-management 1.1.0-SNAPSHOT disabled + session-persistence 1.1.0-SNAPSHOT disabled + +The output of the enable command will indicate whether or not the feature was enabled successfully. + +Policy engine can then be started as usual. + + +End of Document + +.. SSNote: Wiki page ref. https://wiki.onap.org/display/DW/Feature+Test+Transaction |